LM3420M5X-16.8

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The LM3420M5X-16.8 is a perfect example of a PMIC (Power Management IC) specifically designed as a battery charger and appropriate for a wide range of applications. It is a complete solution for providing a regulated output and includes inputs for both AC/DC and USB adapters. It also has an integrated back-bias circuit which is used to reduce the headset noise while in charge or when in other operations. In addition, it comes with different protection mechanisms such as over-current protection, over voltage protection, and thermal shutdown.

This type of battery charger is especially suitable for portable devices since it enables efficient, compact and stable power supply. The LM3420M5X-16.8 works either from an AC/DC adapter or from a charging source compliant with USB power deliver specification. It has an adjustable output voltage range from 4.2 V to 16.8 V and an adjustable output current range from 0.05 A to 0.20 A, which makes it suitable for a wide range of applications. The nominal input voltage range for AC/DC adapter is 4.5 V ≤ Vin ≤ 16.8V, and for USB power deliver specification, it is 4.2 V ≤ Vin ≤ 6.5 V.

The LM3420M5X-16.8 works in three operation modes depending on the input voltage. First, when input voltage is lower than 4.2 V, the device enters in suspend mode. Second, if input voltage is higher than 6.5 V (for USB power deliver specification) or 16.8 V (for AC/DC adapter), the device enters in idle mode. Finally, when input voltage is in the range 4.2 V ≤Vin ≤ 6.5 V (for USB power deliver) or 4.5 V ≤Vin ≤ 16.8V (for AC/DC adapter), the device starts its operation as a battery charger.

The operation mode of the LM3420M5X-16.8 is mainly controlled by a voltage regulator circuit which is composed of a voltage reference, an error amplifier, a power switch, and a compensation network. Based on the control signal, the power switch is turned on or off, which would draw current through the output and raise or lower the output voltage. The error amplifier then compares the voltage references with the output voltage and outputs a control signal to the power switch.

The LM3420M5X-16.8 also has a built-in battery-level detection circuit. This circuit will monitor the voltage across the output power switch and detect when the battery is fully charged. It also ensures a safe and efficient charging cycle by controlling the switching frequency. Furthermore, the device features reverse current protection, short-circuit protection and an over-voltage protection circuit.

As a whole, the LM3420M5X-16.8 is a great PMIC for applications where efficient, compact and stable power supply is needed. It has a voltage regulator circuit that accurately regulates the output voltage, and comes with different protection mechanisms for safety. All these features make it an ideal battery charger for portable devices that uses an AC/DC adapter or USB power deliver.

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